If I remember correctly, it was shown in the few minutes of a documentary about a man jailed with a Mafia boss who admitted to him that he had JFK killed.
02:19 Darnell positioned himself across from the TSBD doorway. He films Howard Brennan on the steps as Brennan spins to his left, twists and takes a spit near the mailboxes. In the doorway a small boy stands on low steps near the west columns. Other men are present - including officers and Don Cook of KTVT Dallas News. A car is parked in front and to the west side of the doorway may be Inspector Sawyers'. 02:24 Darnell continues the scene panning upward toward the sixth floor windows. The windows next to the corner window set are still closed.I have 10 seconds of this scene. I also remember that I have about 10 seconds of footage of Darnell film I have seen only in one TV show.